JP2007047796A - Driving method of plasma display and plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving method of a plasma display panel having a new structure that improves light-emitting efficiency and reduces the likelihood of a permanent afterimage; and also to provide a plasma display device. <P>SOLUTION: The driving method of the plasma display panel comprises driving the plasma display panel including first and second substrates spaced apart from each other, a barrier rib along with the first and the second substrates partitioning discharge cells, first and second electrodes extending to cross each other in the barrier rib, a phosphor layer formed in the discharge cells, and a discharge gas, in which each unit frame is divided into a plurality of sub-fields, and each of the sub-fields has different gray-level weights and is divided into an address and sustain period. In the reset period of the first sub-field of the unit frame, a reset discharge is performed in all the discharge cells and in the reset period of the second sub-field of the second and subsequent sub-fields, the reset discharge is performed only in the discharge cells where the sustain discharge is performed in the sustain period previous to the reset period. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasma display panel (PDP), and more particularly, a driving method for a PDP having a new structure in which luminous efficiency and permanent afterimage are improved, and a plasma display device driven by the driving method. About.

  A PDP that has recently been attracting attention as a replacement for a conventional cathode ray tube display device is that a discharge voltage is applied after a discharge gas is sealed between two substrates on which a plurality of electrodes are formed. This is an apparatus for obtaining a desired image by exciting a phosphor formed in a predetermined pattern.

  FIG. 1 is a partially separated perspective view of a conventional three-electrode surface discharge type PDP, and FIG. 2 is a plan view of the PDP of FIG. 1 taken along the line II-II. Hereinafter, a description will be given with reference to FIGS. 1 and 2.

  The PDP 1 shown in FIGS. 1 and 2 includes a first panel 110 and a second panel 120.

  The first panel 110 includes a first substrate 111, a first dielectric layer 115 disposed to cover the scan electrode lines 112 and the sustain electrode lines 113 on the back surface of the first substrate, and a first dielectric layer 115. A first protective film 116 for protection. The scan electrode line 112 and the sustain electrode line 113 are paired to form a sustain electrode pair 114. The bus electrodes 112a and 113a are made of a metallic material for increasing the conductivity and transparent such as ITO (Indium Tin Oxide). Transparent electrodes 112b and 113b made of a conductive material.

  The second panel 120 is formed on the front surface of the second substrate so as to cover the second substrate 121 and the address electrode lines 122 formed in a direction orthogonal to the direction in which the scan electrode lines 112 and the sustain electrode lines 113 extend. A second dielectric layer 123 disposed in the direction of one substrate; a partition wall 124 defining a discharge cell above the second dielectric layer 123; and a phosphor layer disposed in a space defined by the partition wall 124. 125 and a second protective film 128 on the front surface of the phosphor layer 125 to protect the phosphor layer 125. A discharge gas is injected into a discharge cell (Ce) in a space defined by the partition wall 124.

  In the conventional three-electrode PDP shown in FIGS. 1 and 2, the frame is divided into a plurality of subfields, and each subfield is divided into a reset period, an address period, and a sustain period to display an image. However, the conventional three-electrode PDP1 has the following problems.

  First, visible light emitted from the fluorescent layer 128 is connected to the storage electrode line 113, the scanning electrode line 112, the first dielectric layer 115 covering the electrode lines 112 and 113, which are disposed under the first substrate 110, and There is a problem in that the light emission efficiency is lowered due to a substantial portion (about 40%) being absorbed by the first protective film 116.

  Second, when the conventional PDP 1 as described above displays the same image for a long time, the phosphor layer 128 is ion-sputtered by charged particles of the discharge gas, thereby causing a permanent afterimage.

  As described above, according to the conventional plasma display panel driving method and plasma display apparatus, there is a problem in that the luminous efficiency is low and an afterimage remains.

  Accordingly, the present invention has been made in view of the above problems, and a purpose thereof is to drive a new and improved plasma display panel capable of improving luminous efficiency and improving the afterimage remaining. A method and a plasma display apparatus are provided.

  In order to solve the above problems, according to an aspect of the present invention, in a method for driving a plasma display panel: a first substrate and a second substrate that are spaced apart from each other, and the first substrate and the second substrate And a partition wall that divides a discharge cell that is a discharge space, a first electrode and a second electrode that are disposed in the partition wall and extend so as to intersect with each other, a phosphor layer disposed in the discharge cell, and the discharge The driving method includes a unit frame for displaying an image divided into a plurality of subfields, and each subfield is turned on during a reset period for initializing the discharge cells. An address period for distinguishing a cell to be turned on from a cell that should not be turned on and a discharge cell selected as a cell to be turned on are divided for each subfield. And a sustain period in which the sustain discharge is performed according to the grayscale weight value, and a reset discharge is performed so that the entire discharge cell is initialized in the reset period of the first subfield of the unit frame. In the reset period after the second subfield of the unit frame, the reset discharge is performed so that only the discharge cells in which the sustain discharge is performed in the sustain period before the reset period is initialized. A driving method is provided.

  In the reset period of the first subfield, a rising pulse and a falling pulse may be applied to the first electrode. In a reset period after the second subfield, a falling pulse is applied to the first electrode. May be.

  Further, the rising pulse and the falling pulse may be ramp pulses.

  In the reset period of each subfield, a bias voltage may be applied to the second electrode while the falling pulse is applied.

  In the address period of each subfield, each of the first electrodes is maintained at a high level, and a scan pulse having a low level is sequentially applied, and the second electrode is adjusted to the low level of the scan pulse. A display data signal may be applied.

  Further, in the sustain period of each subfield, a sustain pulse having alternately a high level and a low level may be applied to the first electrode, and a high level and a low level of the sustain pulse may be applied to the second electrode. An intermediate level in between may be applied.

  In order to solve the above problems, according to another aspect of the present invention, in a method for driving a plasma display panel: a first substrate and a second substrate that are spaced apart from each other, and the first substrate and the second substrate The barrier ribs that partition discharge cells in the discharge space together with the substrate, the first electrodes and the second electrodes extending in one direction, and the barrier ribs disposed in the barrier ribs. A unit frame for displaying an image, comprising: a third electrode extending across the second electrode; a phosphor layer disposed in the discharge cell; and a discharge gas in the discharge cell. Is divided into a plurality of subfields, and each subfield includes a reset period for initializing the discharge cells, an address period for distinguishing between cells that should be turned on and cells that should not be turned on, and A discharge cell selected as a cell to be turned on, and a sustain period in which a sustain discharge is performed according to a grayscale weight assigned to each subfield. In the reset period of the first subfield of the unit frame, The reset discharge is performed so that the entire discharge cell is initialized. In the reset period after the second subfield of the unit frame, only the discharge cells in which the sustain discharge is performed in the sustain period before the reset period are initialized. Thus, a method for driving a plasma display panel is provided in which reset discharge is performed.

  Further, the rising pulse and the falling pulse may be applied to the first electrode in the reset period of the first subfield, and the falling pulse is applied to the first electrode in the reset period after the second subfield. May be.

  Further, the rising pulse and the falling pulse may be ramp pulses.

  In the reset period of each subfield, a bias voltage may be applied to the second electrode from the time when the falling pulse is applied.

  In the address period of each subfield, a scan pulse having a low level may be sequentially applied to each of the first electrodes, and a scan pulse of the scan pulse may be applied to the third electrode. A display data signal may be applied in accordance with the low level, and a bias voltage may be applied to the second electrode.

  In the sustain period of each subfield, a sustain pulse may be applied to the first electrode and the second electrode, and a high level of the sustain pulse of the first electrode and the sustain of the second electrode. The high level of the pulse may be applied alternately. Here, the sustain pulse refers to a pulse waveform in which a high level and a low level are alternately applied.

  In order to solve the above problems, according to another aspect of the present invention, a first substrate and a second substrate that are spaced apart from each other, and a discharge cell that is a discharge space together with the first substrate and the second substrate. A partition wall, a first electrode and a second electrode extending in a crossing manner, a phosphor layer disposed in the discharge cell, and a discharge gas in the discharge cell A unit frame is divided into a plurality of subfields to drive the plasma display panel, and each subfield is turned on and a reset period for initializing the discharge cells. An address period for distinguishing a cell to be turned on from a cell that should not be turned on, and a discharge cell selected as a cell to be turned on for each subfield A driving unit that applies a driving signal divided into the reset, address, and sustaining period to each of the electrodes. Are divided into a first driving unit that applies a driving signal to the first electrode and a second driving unit that applies a driving signal to the second electrode. A plasma display apparatus is provided, wherein a rising pulse and a falling pulse are applied during a reset period, and a falling pulse is applied after the reset period of the second subfield.

  The rising pulse and falling pulse may be ramp pulses.

  The second driving unit may apply a bias voltage while the falling pulse is applied in the reset period of each subfield.

  In the address period of each subfield, the first driver may maintain a high level in each of the first electrodes, and sequentially apply a scan pulse having a low level. The display data signal may be applied in accordance with the low level of the scanning pulse.

  In addition, in the sustain period of each of the subfields, the first driver may apply a sustain pulse having a high level and a low level alternately, and the second driver may have a high level of the sustain pulse. An intermediate level with the low level may be applied.

  In order to solve the above-described problem, according to another aspect of the present invention, a first substrate and a second substrate which are spaced apart from each other, and a discharge cell in a discharge space is partitioned together with the first substrate and the second substrate. And a first electrode and a second electrode extending in one direction, and a third electrode extending in a direction intersecting with the first electrode and the second electrode. A plasma display panel comprising: an electrode; a phosphor layer disposed in the discharge cell; and a discharge gas in the discharge cell; and a unit frame having a plurality of sub-frames so as to drive the plasma display panel. Each subfield has a reset period for initializing discharge cells, an address period for distinguishing cells that should be turned on from cells that should not be turned on, and the turn-on A discharge cell selected as a cell to be divided is divided into a sustain period in which a sustain discharge is performed according to a gradation weight assigned to each subfield, and a drive signal divided into the reset, address, and sustain period is applied to each electrode. A driving unit that applies the driving signal, wherein the driving unit applies a driving signal to the first electrode, a second driving unit that applies a driving signal to the second electrode, and the third electrode. The first driving unit applies a rising pulse and a falling pulse during the reset period of the first subfield, and the reset period from the second subfield. A plasma display apparatus characterized by applying a falling pulse is provided.

  The rising pulse and falling pulse may be ramp pulses.

  The second driving unit may apply a bias voltage from the time of applying the falling pulse in the reset period of each subfield.

  In the address period of each subfield, the first driver may maintain a high level in each of the first electrodes, and sequentially apply a scan pulse having a low level. The display data signal may be applied in accordance with the low level of the scan pulse, and the second driver may apply a bias voltage.

  In addition, in the sustain period of each of the subfields, the first driver and the second driver may apply a sustain pulse to the first electrode and the second electrode, and the sustain pulse of the first electrode The high level of the second electrode and the high level of the sustain pulse of the second electrode may be alternately applied.

  As described above, according to the present invention, the luminous efficiency can be improved and the permanent afterimage can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the invention specific matter which has substantially the same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 3 is a first embodiment of a PDP with improved luminous efficiency and permanent afterimage driven by the driving method of the PDP of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV. FIG. 5 is a layout view showing the discharge cell and electrode structure shown in FIGS.

  3 to 5, the PDP 200 includes a first substrate 210, a second substrate 220, a partition wall 214, a first electrode 212, a second electrode 213, a phosphor layer 225, a first protective film 216, Discharge gas is provided.

  The first substrate 210 and the second substrate 220 are disposed opposite to each other and spaced apart from each other.

  The partition wall 214 may be integrally formed as shown in the drawing, and may be formed in a form (a front partition wall and a rear partition wall) that are separated and attached to the first substrate 210 and the second substrate 220, respectively. The barrier ribs 214 form discharge cells (Ce) in a space where discharge is performed together with the first substrate 210 and the second substrate 220. As shown in the drawing, the discharge cell (Ce) may be formed by an opening having a circular cross section in the barrier rib 214, but is not limited thereto, and is a triangle, a rectangle, a pentagon, or an ellipse. A discharge cell (Ce) or the like having a cross section such as may be formed. In addition, the drawing shows that the barrier ribs 214 divide the discharge cells (Ce) in a matrix form, but the present invention is not limited to this. As long as a plurality of discharge spaces can be formed, various patterns such as waffles can be used. It can also be divided into delta shapes.

  In the partition wall 214, the first electrode 212 and the second electrode 213 are spaced apart from each other. The first electrode 212 and the second electrode 213 can be formed so as to completely surround the discharge cell (Ce) as shown in the drawing. However, the first electrode 212 and the second electrode 213 may be formed so as to surround only a part of the discharge cell. Is possible. The first electrode 212 and the second electrode 213 extend in the x direction and the y direction, respectively. For example, referring to FIG. 5, the direction (extended direction) in which the rings of the first electrode 212 are connected is the y direction, and the direction in which the rings of the second electrode 213 are connected is the x direction. On the other hand, in the drawing, it is illustrated that the second electrode 213 and the first electrode 212 are arranged in order from the first substrate to the second substrate direction (−z direction), but the present invention is not limited to this.

  A first protective film 216 made of MgO or the like is preferably formed on the outer surface of the barrier rib 214 that forms the discharge cell (Ce). The first protective film 216 protects the first electrode 212 and the second electrode 213 and the partition wall 214 formed of a dielectric covering the first electrode 212 and the second electrode 213 at the time of discharge, and easily causes discharge by emitting secondary electrons at the time of discharge. be able to.

  The phosphor layer 225 is formed on the first substrate 210, specifically, in a groove 210a formed on the first substrate in the second substrate direction. The position of the phosphor layer 225 is not limited to that shown in the drawing, and may be formed in a groove (not shown) formed on the second substrate in the first substrate direction. Any of the two substrates may be formed.

  The discharge cell (Ce) is filled with a discharge gas, and the discharge gas is any one of neon (Ne), helium (He), or argon (Ar) containing about 10% xenon (Xe) gas. One or two or more mixed gases may be used.

  The first substrate 210 and the second substrate 220 are manufactured of a material having glass as a main component and excellent in translucency. The second substrate 220 is spaced from and opposed to the first substrate 210. The first substrate 210 and the second substrate 220 are preferably formed using substantially the same material. In this case, the thermal expansion coefficient of the first substrate 210 and the thermal expansion coefficient of the second substrate 220 are the same. There is an advantage of becoming.

The partition wall 214 prevents the first electrode 212 and the second electrode 213 from being directly energized during discharge, and prevents charged particles from directly colliding with the first electrode 212 and the second electrode 213 to damage them. These are formed as dielectrics capable of inducing charged particles and accumulating wall charges. Examples of such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ .

  The first electrode 212 and the second electrode 213 are each formed of Ag, Cu, Cr, or the like having high electrical conductivity because a predetermined voltage is applied so that discharge is performed.

For the phosphor layer 225, a phosphor paste in which any one of a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor, a solvent, and a binder is mixed is applied to the groove 210a of the first substrate. After that, it is formed through a drying and firing process. The red light emitting phosphor includes Y (V, P) O ₄ : Eu, the green light emitting phosphor includes ZnSi0 ₄ : Mn, YBO ₃ : Tb, and the blue light emitting phosphor includes BAM: Eu. There is.

  On the other hand, a second protective film (not shown) made of MgO can be formed on the front surface (−z direction) of the phosphor layer 225. The second protective film prevents the phosphor layer 225 from being deteriorated by collision of discharge particles when the discharge is generated in the discharge cell (Ce), and emits secondary electrons so that the discharge is easily generated. .

  The PDP 200 shown in FIGS. 3 to 5 has the following advantages over the conventional PDP 1.

  First, a separate dielectric layer for the first electrode 212 and the second electrode 213 is not required, and the electrode is disposed in the barrier rib, that is, on the side surface of the discharge cell, so that in the discharge space cell (Ce). Visible light generated by this discharge is directly emitted through the first substrate 210 and / or the second substrate 220, so that the luminous efficiency is increased, and a transparent electrode such as ITO is not required as compared with the prior art.

  Second, the first electrode 212 and the second electrode 213 are formed in the barrier ribs, but are formed around the discharge cell, and the electric field is concentrated in the center of the discharge cell (Ce), so that the PDP 200 displays the same image for a long time. Even if displayed, since the phosphor layer 225 is not ion-sputtered by the charged particles of the discharge gas, a permanent afterimage can be prevented. In addition, since discharge can occur in any space of the discharge cell (Ce), response speed and discharge efficiency are increased.

  That is, in the conventional PDP structure shown in FIG. 1, when a discharge occurs between the scan electrode 112 and the sustain electrode 113, the electric field is concentrated on the upper part of the discharge cell, whereas in the PDP structure of FIGS. The electric field in which the electrode and the second electrode are formed on the side wall can be concentrated in the center of the discharge cell. In the PDP structure of FIGS. 3-5, an electric field in which the first electrode and the second electrode are formed in a ring pattern and formed on the entire side wall can occur in all the spaces in the center of the discharge cell.

  FIG. 6 is a timing diagram schematically showing a driving method for driving the PDP of FIG.

  A unit frame for displaying an image is divided into a plurality of subfields, and each subfield is divided into a reset period, an address period, and a sustain period. The reset period is a period for initializing the entire discharge cells, the address period is a period for distinguishing between discharge cells that should be turned on and discharge cells that should not be turned on among the entire discharge cells, and the sustain period is This is a period in which the sustain discharge is performed by the gradation weight assigned to each subfield in the discharge cell to be turned on and the selected discharge cell. As described above, the PDP is driven by the time-division driving method in which the driving signal according to the reset, address, and sustain period is applied to each subfield.

  In the drawing, the unit frame is divided into eight subfields SF1 to SF8, and each subfield is divided into a reset period (not shown), an address period PA1 to PA8, and a sustain period PS1 to PS8. The key weights are assigned from the first subfield to the eighth subfield as 1T, 2T,..., 128T, but this is only an example, and the present invention is not limited to this. That is, the number of subfields of the unit frame is less than or greater than 8, and the assignment of gradation weight values for each subfield can be changed according to the design specifications, unlike the illustrated example.

  FIG. 7 is a simplified block diagram of a plasma display apparatus showing the PDP of FIG. 3 and a driving apparatus for driving the PDP.

  The structure of the PDP 200 in FIG. 3 is a new electrode structure in which electrodes arranged in the partition walls are arranged, and has a two-electrode structure. Therefore, the plasma display device 701 of FIG. 7 is configured more simply than a conventional three-electrode plasma display device.

  3 to 8, the plasma display device 701 of FIG. 7 includes a video processing unit 700, a logic control unit 702, a Y driving unit 704, an A driving unit 706, and a plasma display panel 200. In the present embodiment, the first drive unit is a Y drive unit, and the second drive unit is an A drive unit.

  The video processing unit 700 receives an external video signal such as a PC signal, a DVD signal, a video signal, and a TV signal from the outside, converts an analog signal into a digital signal, performs video processing on the digital signal, and outputs it as an internal video signal. . The internal video signals are 8-bit red (R), green (G), and blue (B) video data, a clock signal, and vertical and horizontal synchronization signals, respectively.

  The logic control unit 702 receives the internal video signal from the video processing unit 700 and outputs a Y drive control signal SY and an A drive control signal SA through gamma correction, an APC (Automatic Power Control) step, and the like. .

  The Y drive unit 704 receives the Y drive control signal SY from the logic control unit 702 and applies a drive signal to the first electrode (212 in FIG. 3). The A drive unit 706 receives the A drive signal from the logic control unit 702. The drive control signal SA is input and a drive signal is applied to the second electrode (213 in FIG. 3). Hereinafter, the first electrode is also referred to as a Y electrode, and the second electrode is also referred to as an A electrode.

  The Y driving unit 704 applies a rising pulse and a falling pulse to the Y electrode so that the entire discharge cell is initialized in the reset period PR1 of the first subfield SF1 in a unit frame including a plurality of subfields. In the reset periods PR2 to PR8 of SF2 to SF8 after the second subfield in the unit frame, Y is set so as to be initialized only to the discharge cells in which the sustain discharge was performed in the sustain periods PS1 to PS7 immediately before the reset periods PR2 to PR8. A falling pulse is applied to the electrode.

  Here, the rising pulse and the falling pulse may be ramp pulses, or may be parabolic pulses in which the magnitude of the instantaneous gradient decreases with time. As described above, if the rising pulse and the falling pulse are applied only in the reset period PR1 of the first subfield, the reset discharge is performed while the wall charges are accumulated around the Y electrode by the application of the rising pulse in the whole discharge cell, and the falling discharge is performed. Reset discharge is performed while erasing wall charges around the Y electrode by applying a pulse.

  If only the falling pulse is applied to the reset periods PR2 to PR8 after the second subfield, the wall charges are already accumulated in the discharge cells in which the sustain discharges are performed in the sustain periods PS1 to PS7 before the reset period. However, there is no accumulated wall charge in the discharge cells in which the sustain discharge is not performed in the sustain periods PS1 to PS7 before the reset period. Therefore, wall charge erasure and reset discharge are not performed even if only the falling pulse is applied. That is, the reset discharge is selectively performed depending on the execution of the sustain discharge.

  According to such a feature of the present invention, the reset periods PR2 to PR8 after the second subfield can be shorter than the reset period PR1 of the first subfield, and the address period is increased due to the trend of high-quality PDPs. If there is no choice but to do so, it is possible to further secure an address period. In addition, since unnecessary reset light is not generated, it is useful for improving the contrast. On the other hand, the Y driving unit 704 applies a scan pulse to the address periods PA1 to PA8 and applies a sustain pulse to the sustain periods PS1 to PS8.

  The A drive unit 706 applies a display data signal in accordance with the scan pulse during the address periods PA1 to PA8. Address discharge is performed in the address periods PA1 to PA8 by the display data signal and the scan pulse.

  FIG. 8 is a diagram illustrating a driving signal for driving the PDP of FIG. 3 according to the first embodiment of the present invention.

  Referring to FIGS. 3 to 8, reset periods PR1 to PR8 are periods for initializing the discharge cells. During the reset period PR1 of the first subfield, the rising and falling pulses are applied to the Y electrode. A falling pulse is applied to the Y electrode during the reset periods PR2 to PR8 after the second subfield, and a low level voltage, for example, the ground voltage Vg is applied to the A electrode during the reset periods PR1 to PR8 of all subfields. Although applied, the bias voltage Vb1 is applied during the falling pulse application.

  The rising pulse rises from the sustain discharge voltage Vs1 to reach the highest rising voltage (Vs1 + Vset1), and the falling pulse falls from the sustain discharge voltage Vs1 to the lowest falling voltage Vnf1. In the reset period PR1 of the first subfield, a reset discharge is generated between the Y electrode and the A electrode while negative wall charges accumulate around the Y electrode in the discharge cell due to the application of the rising pulse. By applying the falling pulse, the negative wall charges accumulated around the Y electrode in the discharge cell are erased, and reset discharge is performed between the Y electrode and the A electrode.

  When a falling pulse is applied in the reset periods PR2 to PR8 after the second subfield, in the discharge cells in which the sustain discharge is performed in the sustain periods PS1 to PS7 before the reset period, the wall charges are near each electrode in the discharge cell. In particular, since it is accumulated near the Y electrode, the reset discharge is performed between the Y electrode and the A electrode while the wall charges are erased by the application of the falling pulse. By the reset discharge, the wall charge state in the discharge cell is initialized, and the wall charge state suitable for the address discharge in the address period is composed. In the discharge cells in which the sustain discharge is not performed in the sustain periods PS1 to PS7 before the reset period, no wall charge is accumulated in the vicinity of the Y electrode. I will not. That is, since the initialization state of the discharge cell has already been formed, it is not necessary to initialize the discharge cell again.

  As a result, a wall charge state suitable for execution of address discharge is formed in the discharge cell after the reset periods PR1 to PR8 by the drive signal of the present invention. According to such a feature of the present invention, the reset periods PR2 to PR8 after the second subfield can be shorter than the reset period PR1 of the first subfield, and the address period does not increase due to the trend of high quality PDP. If it is not obtained, an address period can be further secured. In addition, since unnecessary reset light is not generated, it is useful for improving the contrast.

  The address periods PA1 to PA8 are periods for distinguishing between discharge cells that should be turned on and discharge cells that should not be turned on. In the drawing, address discharge is performed, that is, address discharge is performed only in the discharge cells that are to be turned on. Although the method is illustrated, the present invention is not limited to this, and a selective erasing method, that is, a method in which address discharge is performed in the entire discharge cells and erasure discharge is performed only in the discharge cells that should not be turned on is possible.

  As shown in FIG. 8, according to the write discharge method, a scan pulse having a high-level potential Vsch1 and a low-level potential Vscl1 is sequentially applied to the Y electrode, and is matched with the low-level potential Vscl1 of the scan pulse. A display data signal having a positive potential Va1 is applied to the A electrode. By applying a scan pulse and a display data signal, an address discharge is performed between the Y electrode and the A electrode in the discharge cell. After the address discharge, a positive wall charge is generated around the Y electrode around the A electrode. Accumulates negative wall charges.

  The sustain periods PS1 to PS8 are periods in which a sustain discharge is performed according to a gradation weight assigned to a cell to be turned on and a selected discharge cell, and a high level Vs1 and a low level −Vs1 are alternately applied to the Y electrode. The sustain pulse having a high level Vs1 and a low level −Vs1 are applied to the A electrode. The high level potential of the sustain pulse is also referred to as sustain discharge voltage Vs1.

  The number of sustain pulses is applied in proportion to the gradation weight value. That is, the gradation is expressed as the gradation weight assigned by the number of sustain discharges. First, when a high-level potential Vs1 of the sustain pulse is applied to the Y electrode, the positive wall charge accumulated around the Y electrode in the discharge cell and the negative wall accumulated around the A electrode. The sustain discharge is performed by the electric charge, the potential Vs1 applied to the Y electrode and the potential Vg applied to the A electrode. After the sustain discharge, positive wall charges are present around the A electrode, and around the Y electrode. Negative wall charges accumulate.

  Next, when a low-level potential −Vs1 of the sustain pulse is applied to the Y electrode, the negative wall charges accumulated around the Y electrode in the discharge cell and the positive polarity accumulated around the A electrode. The sustain discharge is performed by the wall charge, the potential −Vs1 applied to the Y electrode, and the potential Vg applied to the A electrode, and after the sustain discharge, a negative wall charge is generated around the A electrode. A positive wall charge accumulates around. By the above method, the sustain discharge is continuously performed according to the number of sustain pulses based on the gradation weight value.

  FIG. 9 is a second embodiment of the PDP driven by the PDP driving method of the present invention, which has improved luminous efficiency and permanent afterimage, and FIG. 10 is a cross-sectional view taken along the line XX. FIG. 11 is a layout view showing the discharge cell and electrode structure shown in FIGS. 9 and 12.

  The PDP 300 shown in FIGS. 9 to 11 is similar to the PDP 200 shown in FIGS. 3 to 5, except that the PDP shown in FIGS. 3 to 5 has a two-electrode structure. 11 is that the PDP has a three-electrode structure. In the following, the differences will be mainly described.

  9 to 11, the PDP 300 includes a first substrate 310, a second substrate 320, a partition 314, a first electrode 312, a second electrode 313, a third electrode 322, a phosphor layer 325, 1 Protective film 316 and discharge gas are provided.

  Description of the first substrate 310, the second substrate 320, the partition wall 314, the phosphor layer 3325, the first protective film 316, and the discharge gas will be omitted because there are descriptions regarding FIGS.

  The first electrode 312, the second electrode 313, and the third electrode 322 are spaced apart from each other in the partition wall 314. The first electrode 312, the second electrode 313, and the third electrode 322 can be formed so as to completely surround the discharge cell (Ce) as shown in the drawing, but is not limited thereto, and only a part of the discharge cell (Ce) is formed. It can also be formed so as to surround. The first electrode 312 and the second electrode 313 extend in one direction (x direction), and the third electrode 322 extends in a direction (y direction) intersecting the direction in which the first electrode 312 and second electrode 313 extend. On the other hand, in the drawing, the second electrode 313, the third electrode 322, and the first electrode 312 are arranged in this order from the first substrate to the second substrate direction (−z direction). Can be arranged in various ways.

  The PDP 300 shown in FIGS. 9 to 11 has the same advantages as the PDP shown in FIGS.

  FIG. 12 is a simplified block diagram of a plasma display apparatus showing the PDP of FIG. 9 and a driving apparatus for driving the PDP.

  The plasma display apparatus 1201 in FIG. 12 is similar to the plasma display apparatus 701 in FIG. 7, and therefore, the difference will be mainly described.

  Referring to FIGS. 9 to 13, the plasma display device 1201 of FIG. 12 includes a video processing unit 1200, a logic control unit 1202, a Y driving unit 1204, an A driving unit 1206, an X driving unit 1208, and a plasma display panel. 300. In the present embodiment, the first drive unit is a Y drive unit, the second drive unit is an X drive unit, and the third drive unit is an A drive unit.

  The video processing unit 1200 performs the same function as the video processing unit 700 in FIG.

  The logic control unit 1202 receives an internal video signal from the video processing unit 1200 and performs a gamma correction, an APC (Automatic Power Control) step, etc., respectively, and a Y drive control signal SY, an A drive control signal SA, and an X drive control. The signal SX is output.

  The Y drive unit 1204 receives the Y drive control signal SY from the logic control unit 1202 and applies a drive signal to the first electrode (312 in FIG. 9), and the X drive unit 1208 receives the X drive signal from the logic control unit 1202. The drive control signal SX is input to apply a drive signal to the second electrode (313 in FIG. 9), and the A drive unit 1206 receives the A drive control signal SA from the logic control unit 1202 and receives the third electrode (FIG. 9). 9 to 322). Hereinafter, the first electrode is also referred to as Y electrode, the second electrode as X electrode, and the third electrode as A electrode.

  The Y driving unit 1204 applies a rising pulse and a falling pulse to the Y electrode so that the entire discharge cell is initialized during the reset period PR1 of the first subfield SF1 of the unit frame including a plurality of subfields. In the reset periods PR2 to PR8 of the second subfield after the second subfield in the unit frame, only the discharge cells in which the sustain discharge is performed in the sustain periods PS1 to PS7 immediately before the reset periods PR2 to PR8 are initialized. A falling pulse is applied to the Y electrode.

  Here, the rising pulse and the falling pulse may be ramp pulses. Alternatively, it may be a parabolic pulse in which the magnitude of the instantaneous gradient decreases with time. As described above, if the rising pulse and the falling pulse are applied only in the reset period PR1 of the first subfield, the reset discharge is performed while the wall charges are accumulated around the Y electrode by the application of the rising pulse in the whole discharge cell, and the falling discharge is performed. Reset discharge is performed while erasing wall charges around the Y electrode by applying a pulse.

  If only the falling pulse is applied to the reset periods PR2 to PR8 after the second subfield, the wall charges are already accumulated in the discharge cells in which the sustain discharges are performed in the sustain periods PS1 to PS7 before the reset period. However, the reset discharge is performed while the accumulated wall charge starts to be erased even when only the voltage is applied, but there is no accumulated wall charge in the discharge cells in which the sustain discharge is not performed in the sustain periods PS1 to PS7 before the reset period. Therefore, wall charge erasure and reset discharge are not performed even if only the falling pulse is applied.

  That is, the reset discharge is selectively performed depending on the execution of the sustain discharge. According to such a feature of the present invention, the reset periods PR2 to PR8 after the second subfield can be made shorter than the reset period PR1 of the first subfield, and the address period is further increased by the trend of high-quality PDP. If there is only an increase, an address period can be further secured. In addition, since unnecessary reset light is not generated, it is useful for improving the contrast.

  The Y driving unit 1204 applies a scan pulse having the low level Vscl2 in order to maintain the high level Vsch2 in the address periods PA1 to PA8, and alternately switches the high level Vs2 and the low level Vg in the sustain periods PS1 to PS8. A sustain pulse is applied.

  The X driver 1208 applies the bias voltage Vb2 from the application of the falling pulse in the reset period to the address period, and applies the sustain pulse having the high level Vs2 and the low level Vg alternately in the sustain period. The sustain pulse output from the Y drive unit 1204 and the sustain pulse output from the X drive unit 1208 alternate with each other, whereby a sustain discharge is performed in the discharge cell.

  The A drive unit 1206 applies a display data signal in accordance with the scan pulse during the address period. Address discharge is performed in the address period by the display data signal and the scan pulse.

  FIG. 13 illustrates a driving method according to the second embodiment of the present invention, and illustrates driving signals for driving the PDP of FIG.

  The driving method of FIG. 9 is based on the time-division gradation expression method, which is based on the method shown in FIG. On the other hand, the drive signal in FIG. 13 is similar to the drive signal in FIG.

  Referring to FIGS. 9 to 13, the reset periods PR1 to PR8 are periods for initializing the discharge cells. During the reset period PR1 of the first subfield, the rising and falling pulses are applied to the Y electrode. A falling pulse is applied to the Y electrode during the reset periods PR2 to PR8 after the second subfield, and a low level voltage, for example, a ground voltage Vg is applied to the X electrode during the reset periods PR1 to PR8 of all subfields. Although applied, the bias voltage Vb2 is applied during the application of the falling pulse, and the low-level voltage Vg is applied to the Y electrode. The rising pulse rises from the sustain discharge voltage Vs2 and reaches the highest rising voltage Vs2 + Vset2, and the falling pulse falls from the sustain discharge voltage Vs2 and falls to the lowest falling voltage Vnf2.

  In the reset period PR1 of the first subfield, negative wall charges are accumulated around the Y electrode in the discharge cell by applying the rising pulse, and between the Y electrode and the A electrode and between the Y electrode and the X electrode. Reset discharge occurs. By applying the falling pulse, the negative wall charges accumulated around the Y electrode in the discharge cell are erased, and a reset discharge is performed between the Y electrode and the A electrode and between the Y electrode and the X electrode. Is called.

  When a falling pulse is applied in the reset periods PR2 to PR8 after the second subfield, in the discharge cells in which the sustain discharge is performed in the sustain periods PS1 to PS7 before the reset period, the wall charge is near each electrode in the discharge cell. In particular, since it is accumulated near the Y electrode, reset discharge is performed between the Y electrode and the A electrode and between the Y electrode and the X electrode while the wall charges are erased by the application of the falling pulse.

  By the reset discharge, the wall charge state in the discharge cell is initialized, and the wall charge state suitable for the address discharge in the address period is composed. In the discharge cells in which the sustain discharge is not performed in the sustain periods PS1 to PS7 before the reset period, the wall charge does not accumulate in the vicinity of the Y electrode. Therefore, there is no wall charge to be erased even when the falling pulse is applied, so the reset discharge is also performed. I will not. That is, since the initialization state of the discharge cell has already been formed, there is no need to initialize the discharge cell again. As a result, a wall charge state suitable for execution of address discharge is formed in the discharge cell after the reset periods PR1 to PR8 by the drive signal of the present invention.

  According to such a feature of the present embodiment, the reset periods PR2 to PR8 after the second subfield can be made shorter than the reset period PR1 of the first subfield, and further, the address period is increased by the trend of high-quality PDP. Further, it is possible to further secure an address period when there is only increase. In addition, since unnecessary reset light is not generated, it is useful for improving the contrast.

  The address periods PA1 to PA8 are periods for distinguishing between discharge cells that should be turned on and discharge cells that should not be turned on. In the drawing, an address discharge method, that is, a method in which address discharge is performed only in the discharge cells that are to be turned on However, the present invention is not limited to this, and a selective erasing method, that is, a method in which address discharge is performed in the entire discharge cells and erasure discharge is performed only in the discharge cells that should not be turned on is possible.

  As shown in the drawing, according to the write discharge method, a scan pulse having a high level potential Vsch2 and a low level potential Vscl2 is sequentially applied to the Y electrode, and the high level is matched with the low level potential Vscl2 of the scan pulse. A display data signal having Va2 is applied to the A electrode, and the bias voltage Vb2 is continuously applied to the X electrode. By applying a scan pulse and a display data signal, an address discharge is performed between the Y electrode and the A electrode in the discharge cell. After the address discharge, a positive wall charge is generated around the Y electrode around the A electrode. Has negative wall charges, and negative wall charges accumulate around the X electrode.

  The sustain periods PS1 to PS8 are periods in which a sustain discharge is performed according to the gradation weight assigned to the cell to be turned on and the selected discharge cell, and the high level Vs2 and the low level Vg are applied to the Y electrode and the X electrode. Are alternately applied, and a low-level potential Vg is applied to the A electrode. The high level potential of the sustain pulse is also referred to as sustain discharge voltage Vs2. The number of sustain pulses is applied in proportion to the gradation weight value. That is, the gradation is expressed as the gradation weight assigned by the number of sustain discharges.

  First, when a high-level potential Vs2 of the sustain pulse is applied to the Y electrode, the positive wall charge accumulated around the Y electrode in the discharge cell and the negative wall accumulated around the X electrode. The sustain discharge is performed by the electric charge, the potential Vs2 applied to the Y electrode and the potential Vg applied to the X electrode. After the sustain discharge, positive wall charges are present around the X electrode, and around the Y electrode. Negative wall charges accumulate. Next, when the high-level potential Vs2 of the sustain pulse is applied to the X electrode, the negative wall charge accumulated around the Y electrode in the discharge cell and the positive wall accumulated around the X electrode. A sustain discharge is performed by the electric charge, the potential Vg applied to the Y electrode, and the potential Vs2 applied to the X electrode. After the sustain discharge is completed, a negative wall charge is generated around the X electrode, A positive wall charge accumulates in. By the above method, the sustain discharge is continuously performed according to the number of sustain pulses based on the gradation weight value.

  As described above, according to the driving method of the present invention for the PDP having the new structure, the reset discharge is performed in the entire discharge cells in the reset period of the first subfield, but in the reset period from the second subfield, Reset discharge is performed only in the discharge cells in which the sustain discharge has been performed in the previous sustain period.

  Since the reset discharge is selectively performed by the sustain discharge in the sustain period, unnecessary reset light can be reduced and the contrast is improved.

  Furthermore, since the reset period from the second subfield can be substantially shorter than the reset period of the first (first) subfield, the shortened reset period length can be assigned to the address period, Addressing can be performed stably.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  The present invention is suitably used in the related technical field of plasma display devices.

Comments, details, but please refer to the following Hinaga when correcting in the future
It is a partial separation perspective view of a PDP of a three-electrode surface discharge method according to the prior art. It is the top view which cut out PDP of FIG. 1 along the II-II line. 1 is a view showing a PDP according to a first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a layout view showing the discharge cell and electrode structure shown in FIGS. 3 and 4. FIG. 4 is a timing diagram schematically showing a driving method for driving the PDP of FIG. 3. 4 is a simplified block diagram of a plasma display device showing the PDP of FIG. 3 and a driving device for driving the PDP. FIG. 3 is a diagram illustrating a driving signal for driving the PDP according to the first embodiment of the present invention. 6 is a diagram illustrating another example of a PDP improved in luminous efficiency and permanent afterimage driven by the PDP driving method of the present invention. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. FIG. 13 is a layout view showing the discharge cell and electrode structure shown in FIGS. 9 and 12. FIG. 10 is a simplified block diagram of a plasma display device showing the PDP of FIG. 9 and a driving device for driving the PDP. 4 is a diagram illustrating a driving signal for driving a PDP according to a second embodiment of the present invention.

Explanation of symbols

200 PDP
210 First substrate 210a Groove 212 First electrode 213 Second electrode 214 Partition 216 First protective film 220 Second substrate 225 Phosphor layer

Claims (22)

In the driving method of the plasma display panel:
A first substrate and a second substrate that are spaced apart from each other, a partition that partitions discharge cells that are discharge spaces together with the first substrate and the second substrate, and a partition that is disposed within the partition and extends across the partition. A first electrode and a second electrode provided, a phosphor layer disposed in the discharge cell, and a discharge gas in the discharge cell,
In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, and each subfield includes a reset period for initializing the discharge cells, cells to be turned on and cells that should not be turned on. And a sustain period in which a sustain discharge is performed according to a gradation weight assigned to each subfield in the discharge cell selected as the cell to be turned on,
In the reset period of the first subfield of the unit frame, reset discharge is performed so that the entire discharge cell is initialized, and in the reset period after the second subfield of the unit frame, the sustain period before the reset period A method for driving a plasma display panel, characterized in that a reset discharge is performed so that only discharge cells that have undergone a sustain discharge are initialized. In the reset period of the first subfield, a rising pulse and a falling pulse are applied to the first electrode,
The method of claim 1, wherein a falling pulse is applied to the first electrode in a reset period after the second subfield.   The method of claim 2, wherein the rising pulse and the falling pulse are ramp pulses.   4. The method of driving a plasma display panel according to claim 2, wherein a bias voltage is applied to the second electrode while the falling pulse is applied in the reset period of each subfield. .   In the address period of each subfield, the first electrode is maintained at a high level, a scan pulse having a low level is sequentially applied to each of the first electrodes, and a low pulse of the scan pulse is applied to the second electrode. 5. The method of driving a plasma display panel according to claim 1, wherein a display data signal is applied in accordance with the level.   In the sustain period of each subfield, a sustain pulse having alternating high and low levels is applied to the first electrode, and an intermediate level between the high and low levels of the sustain pulse is applied to the second electrode. The method for driving a plasma display panel according to claim 1, wherein the method is applied. In the driving method of the plasma display panel:
A first substrate and a second substrate that are spaced apart from each other, a partition wall that partitions discharge cells in a discharge space together with the first substrate and the second substrate, and disposed in the partition wall, but extends in one direction. A first electrode and a second electrode; a third electrode disposed in the partition but extending across the first electrode and the second electrode; a phosphor layer disposed in the discharge cell; A discharge gas in the discharge cell,
In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, and each subfield includes a reset period for initializing the discharge cells, cells to be turned on and cells that should not be turned on. And a sustain period in which a sustain discharge is performed according to a gradation weight assigned to each subfield in a discharge cell selected as a cell to be turned on,
In the reset period of the first subfield of the unit frame, reset discharge is performed so that the entire discharge cell is initialized, and in the reset period after the second subfield of the unit frame, the pre-reset period is maintained. A method for driving a plasma display panel, characterized in that reset discharge is performed so that only discharge cells that have undergone sustain discharge in a period are initialized. In the reset period of the first subfield, a rising pulse and a falling pulse are applied to the first electrode,
8. The method of claim 7, wherein a falling pulse is applied to the first electrode during a reset period after the second subfield.   The method of claim 8, wherein the rising pulse and the falling pulse are ramp pulses.   10. The method of driving a plasma display panel according to claim 8, wherein a bias voltage is applied to the second electrode from the time of applying the falling pulse in the reset period of each subfield.   In the address period of each subfield, the first electrode is maintained at a high level, a scan pulse having a low level is sequentially applied to each of the first electrodes, and a low pulse of the scan pulse is applied to the third electrode. 11. The method of driving a plasma display panel according to claim 7, wherein a display data signal is applied in accordance with a level, and a bias voltage is applied to the second electrode.   The method of claim 8, wherein a high-level sustain pulse is alternately applied to the first electrode and the second electrode during the sustain period of each subfield. . A first substrate and a second substrate that are spaced apart from each other, a partition that partitions discharge cells that are discharge spaces together with the first substrate and the second substrate, and a partition that is disposed within the partition, but intersects each other. A plasma display panel comprising: first and second electrodes extending in a row; a phosphor layer disposed in the discharge cell; and a discharge gas in the discharge cell;
In order to drive the plasma display panel, a unit frame is divided into a plurality of subfields. Each subfield includes a reset period for initializing the discharge cells, cells to be turned on, and cells that should not be turned on. And the sustain period in which the sustain discharge is performed according to the gradation weight assigned to each subfield in the discharge cell selected as the cell to be turned on. And a drive unit that applies a drive signal divided into sustain periods to each of the electrodes, and
The driving unit is divided into a first driving unit that applies a driving signal to the first electrode and a second driving unit that applies a driving signal to the second electrode.
The plasma display apparatus, wherein the first driving unit applies a rising pulse and a falling pulse during a reset period of the first subfield, and applies a falling pulse after the reset period of the second subfield.   The plasma display apparatus of claim 13, wherein the rising pulse and the falling pulse are ramp pulses.   15. The plasma display apparatus according to claim 13, wherein the second driving unit applies a bias voltage while the falling pulse is applied in a reset period of each subfield. .   In the address period of each subfield, the first driving unit maintains a high level in each of the first electrodes, sequentially applies a scan pulse having a low level, and the second driving unit applies the scan pulse. The plasma display apparatus according to any one of claims 13 to 15, wherein a display data signal is applied in accordance with the low level.   In the sustain period of each of the subfields, the first driver applies a sustain pulse having a high level and a low level alternately, and the second driver has an intermediate between the high level and the low level of the sustain pulse. The plasma display device according to claim 13, wherein a level is applied. A first substrate and a second substrate that are spaced apart from each other, a partition that partitions discharge cells in a discharge space together with the first substrate and the second substrate, and a partition that is disposed in the partition but extends in one direction. A first electrode and a second electrode; a third electrode disposed in the partition but extending across the first electrode and the second electrode; a phosphor layer disposed in the discharge cell; and the discharge A plasma display panel comprising a discharge gas in the cell;
In order to drive the plasma display panel, a unit frame is divided into a plurality of subfields, and each subfield separates cells that should be turned on and cells that should not be turned on during a reset period for initializing discharge cells. And a sustain period in which a sustain discharge is performed according to a gradation weight assigned to each subfield in a discharge cell selected as a cell to be turned on, and is divided into the reset, address, and sustain period. A drive unit that applies a drive signal to the electrodes,
The drive unit includes a first drive unit that applies a drive signal to the first electrode, a second drive unit that applies a drive signal to the second electrode, and a third drive that applies a drive signal to the third electrode. Divided into parts,
The plasma display apparatus, wherein the first driving unit applies a rising pulse and a falling pulse during a reset period of the first subfield, and applies a falling pulse during a reset period from the second subfield.   The plasma display apparatus of claim 18, wherein the rising pulse and the falling pulse are ramp pulses.   The plasma display apparatus of claim 18, wherein the second driving unit applies a bias voltage from the time of applying the falling pulse in the reset period of each subfield.   In the address period of each subfield, the first driving unit maintains a high level in each of the first electrodes, sequentially applies a scan pulse having a low level, and the third driving unit includes the scan pulse. 21. The plasma display apparatus according to claim 18, wherein a display data signal is applied in accordance with a low level of the second driving unit, and the second driving unit applies a bias voltage.   The first driving unit and the second driving unit alternately apply a high level sustain pulse to the first electrode and the second electrode in the sustain period of each subfield. The plasma display apparatus in any one of -21.

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